Final Report Summary - TGF-MEPPA (Terrestrial Gamma Flashes-the Most Energetic Photon Phenomenon in our Atmosphere)
The TGF-MEPPA project has delivered several “firsts”. We were the first to report on the sequence of radio, optical and gamma-rays signals from thunderstorms (Østgaard et al., 2013), we were the first to perform an aircraft campaign at 20 km altitude directly above lightning activity, we were the first to detect gamma-glows (minute long) from above thundercloud, we were the first to report the detection of relativistic electrons from laboratory experiments of electric discharges (Østgaard et al., 2016) and we were the first to perform a detailed analysis with fast cameras on nanosecond time scale of the streamer formation in laboratory sparks, the so-called “pilot systems” (Kochkin et al., 2016). We have also developed novel methods to identify many more TGFs in existing datasets (Østgaard et al., 2015, Marisaldi et al., 2015). We have carried out modeling efforts of streamer properties trying to understand how electrons can be accelerated to relativistic energies in the laboratory (Lehtinen et al., 2018), but this is still an open question for the community. We have also carried out modeling of the suggested scenarios for producing TGFs (Skeltved et al. 2014; 2017) and found that they both require extreme thunderstorm charging to explain observations. We have published 29 papers in peer-reviewed journals, given 84 presentations at international meetings, of which 13 were invited. TGF-MEPPA has produced 2 PhD theses and 5 Master theses. We have organized 10 sessions at AGU and EGU meetings and played a major role in 2 research schools organized within the European network projects, TEA-IS and SAINT, in which we have been active partners. The PI of TGF-MEPPA has been in the leader group of both networks. Our team members have received prestigious awards, such as Fulbright stipend, Yara´s Birkeland Prize and the PI was invited UN Committee on the Peaceful Uses of Outer Space (COPUOS) to give a report on our scientific achievements. Our scientific results has been highlighted by AGU press release and Journal of Physics as the “image of the week”. Our public outreach efforts have lead to hundreds of media coverage, both news media, radio and TV, with the ASIM launch as the absolute number one – more than 300 in Europe. We can be found via our web-page (https://birkeland.h.uib.no/research/gamma-ray-flashes/)
Facebook (https://www.facebook.com/birkelandcentre/) and Twitter
(https://twitter.com/birkelandbcss?lang=en).